The men of 'NKOTB' were well aware of Full/Fuller House's desire to have them on the show.

Receive the latest entertainment-news updates in your inbox

File photo of actresses Candace Cameron-Bure, Jodie Sweetin, and Andrea Barber attend the premiere of Netflix's 'Fuller House' at Pacific Theatres at The Grove on February 16, 2016 in Los Angeles, California.

For the ladies of Fuller House--particularly Andrea Barber and Candace Cameron Bure--having New Kids on the Block guest star is a dream come true. A 30-year dream come true.

"We've been wanting New Kids on the Block on the show for 30 years," Barber, who plays Kimmy Gibbler on the series, said in the behind-the-scenes video. "Seeing the New Kids on the Block in the living room on the Fuller House couch blew my mind."

Cameron Bure and Barber went to New Kids on the Block concerts together in the 1990s and still go together. In fact, Barber brought in all of her NKOTB merchandise and outfitted the crew and extras in the scene. The ladies were so into the guest spot, they even sent notes to the prop department to get the stage set right and make sure the men had color-coded microphones like at their concerts.

"We got to actually sing their songs on stage with them," Barber said. "I mean, in what universe am I living?"